Elecraft

Fw: Re: Mobile antenna breakthrough?

Classic

List

Threaded

4 messages Options

riese-k3djc

Fw: Re: Mobile antenna breakthrough?

Subject: Re: [Elecraft] Mobile antenna breakthrough?

someone makes a rear window antenna ,,,, held with sticky pads to the
inside
of the glass,, worked well on 144

Bob K3DJC

On Sun, 20 Aug 2017 17:15:20 -0700 Phil Kane <[hidden email]> writes:
> On 8/19/2017 9:26 PM, Doug Smith wrote:
>
> > Yes, I was thinking along the same lines ? that copper
> ?conductive tape? stuff.
> >
> > It could be mounted to the outside of the carrier and would look
> like stylish racing stripes!

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

Ken G Kopp

Re: Mobile antenna breakthrough?

Larsen makes a VHF mobile antenna that mounts on a vehicle window and is
fed via a capacity coupling arrangement mounted on the inside of the glass.

Some of you have been talking about an antenna that's known as a DDRR and
perhaps not realizing it.

Google is your friend ....

73

Ken - K0PP

On Aug 20, 2017 19:27, <[hidden email]> wrote:

>
> Subject: Re: [Elecraft] Mobile antenna breakthrough?
>
> someone makes a rear window antenna ,,,, held with sticky pads to the
> inside
> of the glass,, worked well on 144
>
> Bob K3DJC
>
>
> On Sun, 20 Aug 2017 17:15:20 -0700 Phil Kane <[hidden email]> writes:
> > On 8/19/2017 9:26 PM, Doug Smith wrote:
> >
> > > Yes, I was thinking along the same lines ? that copper
> > ?conductive tape? stuff.
> > >
> > > It could be mounted to the outside of the carrier and would look
> > like stylish racing stripes!
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

k6dgw

Re: Mobile antenna breakthrough?

The now-defunct Southern Pacific Railroad, acquired by Union Pacific 20
or so years ago, used DDRR VHF antennas on their trackside signaling
equipment. They were cast steel [maybe brass under the finish], very
low profile on top of the equipment box, small [they looked like a
handle], and about as indestructible as the steel box they were on.
Indestructability is fairly important with stuff trackside in the middle
of nowhere. With antennas however, electrical size matters. Rear
window size at VHF is big ... not so much on 40 meters.

So, does my 41.4 meter wire at 1.8 meters AGL classify as a DDRR?

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 8/20/2017 6:52 PM, Ken G Kopp wrote:

> Larsen makes a VHF mobile antenna that mounts on a vehicle window and is
> fed via a capacity coupling arrangement mounted on the inside of the glass.
>
> Some of you have been talking about an antenna that's known as a DDRR and
> perhaps not realizing it.
>
> Google is your friend ....
>
> 73
>
> Ken - K0PP
>
>
>
>
>
> On Aug 20, 2017 19:27, <[hidden email]> wrote:
>
>> Subject: Re: [Elecraft] Mobile antenna breakthrough?
>>
>> someone makes a rear window antenna ,,,, held with sticky pads to the
>> inside
>> of the glass,, worked well on 144
>>
>> Bob K3DJC
>>
>>
>> On Sun, 20 Aug 2017 17:15:20 -0700 Phil Kane <[hidden email]> writes:
>>> On 8/19/2017 9:26 PM, Doug Smith wrote:
>>>
>>>> Yes, I was thinking along the same lines ? that copper
>>> ?conductive tape? stuff.
>>>> It could be mounted to the outside of the carrier and would look
>>> like stylish racing stripes!
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

Phil Kane-2

Re: Mobile antenna breakthrough?

On 8/20/2017 7:30 PM, Fred Jensen wrote:

> e now-defunct Southern Pacific Railroad, acquired by Union Pacific 20 or
> so years ago, used DDRR VHF antennas on their trackside signaling
> equipment. They were cast steel [maybe brass under the finish], very
> low profile on top of the equipment box, small [they looked like a
> handle], and about as indestructible as the steel box they were on.
> Indestructability is fairly important with stuff trackside in the middle
> of nowhere.

In the rail industry, these are known as "Excalibur" antennas - the
model type made by Sinclair. They were developed for the transit
industry for buses and locomotives to be able to go through industrial
wash racks with no damage We used both the VHF Low-Band and VHF
High-Band models on a measurement truck and were very happy with them.
Use of this type of antenna on wayside equipment such as hot-box and
dragging equipment scanners is pretty much standard for the reasons that
you gave above. I'd put one on our car but I don't know how the VHF
model that I would use for 2-meters would perform on UHF (3/4-meters)
like my 1/4-wave mag-mount vertical does.

73 de K2ASP - Phil Kane
Elecraft K2/100 s/n 5402

From a Clearing in the Silicon Forest
Beaverton (Washington County) Oregon
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]